Though my earliest favorite dinosaur was the Diplodocus (why? dunno... maybe the sheer size of it), lately I've found myself drawn to the Spinosaurus. It is a pretty spectacular beastie, no? This is a pretty nice model, but the scary paintjob more or less covers up all the detail. He'll be repainted at some point.
Velociraptors are just adorable, feathered or not! The bald ones do have the advantage of showing more detail, but I don't really have a favorite interpretation, and frankly I am willing to overlook scientific accuracy if the sculptural quality is high enough.
This one I've named Squeaky. Because... what the hell, why not?